Combination nut running and setting tool



Oct. 21, 1952 E. H. SHAFF 2,614,419

COMBINATION NUT RUNNING AND SETTING TOOL Filed June 10, 1947 '3 Sheets-Sheet 1 Z w m v H, H m m6 3 a. 1 2 T h a I N W a .T. L N

Elk-neat" H 62*.

Oct. 21, 1952 E. H. SHAFF COMBINATION NUT RUNNING AND SETTING TOOL s Shget-Sheet 2 Filed June 10. 194'? it I! i \\\i NVENPFQM vwss'tr Q4. 5ha a g 111%. gfl-r-romnY- Oct. 21, 1952 E. SHAFF COMBINATION NUT RUNNING AND SETTING TOOL 3 Sheets-Sheet 55 Filed June 10. 194'? A I -7///////////////4///4I//////////Z7////4u7////7//////47//// 7/ w/// M M? H- .lkk

NVENTO k H. Shel firne st .1%

Patented Oct. 21, 1952 COMBINATION .NUT RINNINGAND SETTING TO L Ernest H. Shaft, Spring Lake, Mich., assignor, by

mesne assignments, to. Keller Tool Company, Grand Haven, Mich., a corporation of Michigan" Application June 10, 1947, Serial No. 753,598

18 Claims. (01. 73-139) The present invention pertains to portable tools for running and setting screw-threadedfastening elements such as nuts, bolts and screws.

h Generally stated, it is an object of the invention to provide a tool'of theabove-general'character by which such fastening elements may be run by power actuation of the tool and set by manual. operation thereof and which includes means to indicate attainment of the desired degree'of tightness. g

Another object is to provide a combined nutrunner and torque wrench of the character set forth above wherein conversion frompo'wer to manual operation is incidental to the shutting 01f of the power. f

The objects of the invention thus generally set forth together with other and ancillary advantages are attained by the construction and arrangement shown by way of illustration in the accompanying drawings, in which:

[Figure 1 is a plan view of the combined nutrunner and torque wrench. I N Fig. 2 is a sectional side elevation taken substantially in the plane of line 22 in Fig. 1.

'jFig. 3 isa sectional elevation taken substantially in the plane of line 3-3 in Fig. 2 and showi'ng the relationship of the elements when the tool is power actuated. V g Fig. 4 is a sectional elevation substantially in the plane of line 4-4 in Fig. 2.

Fig; 5 is a vertical section illustrating the relationship of the tool elementsunder manual application of force to the tool.

' Fig.5 is a sectional elevation taken substantially in the plane of line 3--3 in Fig. 1 and showingcomponent relationship for forward manual 'peration of the tool. Fig. 7 is a sectional elevation taken substantially in the plane of line 33 in Fig. 1 and showing" component relationship for reverse manual operation of the tool. v H Fig. 8 is an end elevation partly in section taken substantiallyin the plane of line8-'-3 in Fig. 5.

:Fig. 9 isfa plan view of'a modified form of the combined nut runnerand torque wrench also embodying thepres'ent invention; I

Fig. 10 is a sectional-side elevation taken substantially in the plane of line I ll-l ii in Fig. 9.

' FigQll is a sectional elevation taken-substan tiall'y in the plane of line I il l in Fig. 10- Fig. 12 is a sectional'ele'vation taken substan tially in the plane of line l2l2 in Fig; 105

'While' the invention is susceptible of various modifications and alternative constructions, there isshown in the drawings andgwill herein be. de

scribed in detail the preferred embodiments, but it is to be understood that it is not thereby intended to limit the invention to the form disclosed, but it is intended to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

In carrying out my invention I provide, a portable tool comprising a power unit 10 embodying v a rotary motor I! enclosed within a casing 12, and a tool head l3 connected with the power unit in laterally spaced relation thereto and having a driven shaft l4 connected with the motorjof the power unit by a drive shaft [5. The driven shaft is constructed for the mounting of 'a: "suitable adaptor varying in accordance with the character of the threaded element to be driven, and isjdisposed at right angles to the drive shaft. In the operation of the tool in running a screw, nutf or other threaded element, the drivenshaft is rotated continuously, but in order'that the tool can be used for tightening or setting the threaded element manually, a disengageable connection I6 is provided between the driven shaft and the tool head so constructed and arranged as to-be ineifective when the shaft is driven by 'the motor but operative when the motor is idle to permit of the application of a rotativeforce to the tool head and therefore to the driven'shaft by the application of a lateral manual force to the. power unit. Finally, I provide indicator means l1 responsive to relative lateral movement between the. tool head and the power unit to indicate to the operator the degree of torque applied manually to the driven shaft, the drive shaft being made flexible to permit of such relative movement. g In the present embodiment shown in Figs. 1 to 8,.the drive motor II is of the reversible rotary fluid pressure actuated type and includes a rotor Hi fasten a spindle IS. The latter is journaled adjacent its forward end in 'a bearing!!! which in turn is held in a frame collar 2] made stationary with respect to the casing l2-of the: power unit. The outer end of 'the casing, herein the right end, terminates in a handle 22, and pressure fluid for the motor is supplied by wayof an inlet fitting 23 on the outer end of the handle. The admission of pressure-fluid to the motor iscontrolled by a reversing valve assembly 25. j.

In the instant embodiment, the tool head "13 includes a housing 3!] of generally cylindrical form having a chamber 3| therein'which is closed at its top by a plug 32. The driven shaft I is journaled intermediate itsends in a l; ore; -33 in the housing 30 and is supported at its upper and preferably made integral therewith isi a boss 38 having a bore 39 thereinwhich extends coaxially with the longitudinal axis ofthetool.

The tool head 13 is connected with the power unit through the medium of a. bllhesm oneend, of which is secured in the bore.;3.3;iby set screw 39a and the other end thereofif'fixedwithin the stationary frame collar 2 [of the power uni Extending coaxially within the tube 40 and connecting the motor of the power unit with the" tool head is the drive shaft [5 which is convenientlyi oined at. one: end. to. the motor: Spindle, l.9.vby'means,of a tongue andgroove. joint. M. The. other or: tenninalend of he, drive shaft, projects-.- beyond the supporting tube 40, and carries. a bevel-pinion 42. which may be made. integral-with the. drive. shaft 15. The teeth. of the bevel pinion 42 are in mesh; withthose of the. bevel gear, 31 thus. completing the. driving connection betweenthe motor of the. power unit. and the drivenshaft 1.4 so. that-inthe operation of. the tool in running. a. fastening element thed-riven. shaft is. rotated continuously in one dir cti n or the. o h n So, that the driven shaft, I14 may be. rotated by-the application. of, alateral manual. force. to. hey motor unit'in, order, to finally tighten or setzafastening element, the disengageable, con.- nection Lois. provided between. the tool head housing 3.0 and. the driven. shaft. 14. In. the. present instance this connection is ofv the-pawl. an ratchet-type.v It includes apawi 43.no-v sitionedwinsnaccd. relationto the axis. of, the driven; IA- and. beneath. the bevel... gear. 3.1. Thebevelgear. inthepresent instance. is, utilized .to provide. a. ratchet-disk rigidwiththe driven sh ftv l4; Thus it is. provided with a seriespf, radiallyextending, notches 44, in its lower face.

, The, pawl 43;. isrieid with, the, upper. end. ofa. plunger 45 which serves as. an actuator therefor. The. latter has.,a.,sliding; fit. in abore or recess 46. provided in. the. chamber? and, in, com; municationatherewithe A spring 4,! tend to urge the plunger. 45. upwardly to. carry. the. pawl 1. 10. engagement. with the. notches. 44 of. the. ratchet disk. To provide. ratchet action. ineither. diectionrof operation,theplunser can be rotate throu h/L80? by means ofia fingerpiece 48 .extendingradially therefrom so that the direction of. presentation of the. flat face of the pawl to thenotch walls can be .reversed.

' aboye, indicated, the connection It. is rendered;.ineff,ective; whenpower is applied to the motor. H; to" drive. the shaft l4. This is accomplished inthe present instance by fluid pressure, inasmuch as. the motor employed is of the. .fluid pressure type. To this end, the chamber 3!; is connected to the fluid-pressure supply. Thus a passage, 49 extends from'the toolhead chamber 3| longitudinally through the drive shaft I15 and the motor spindle I9, The man her of supplying air to the passage 49' will be fully explained in the modified form hereinafter described.

It willbe observed that air delivered to the tool head chamber 3| is free topass around 4 the bevel gear 31 and act on the upper surface of the plunger 45 to force it downwardly against the action of the spring 41. Thus as an incident to the application of the motive power to the motor, the ratchet pawl 43 is forced out of engagement with the bevel gear notches 44. cont seln, w en e f st i g el me become tight and the power is. shut-61f, pressure in the tool head chamber 3| is released, and

the Spring 41 will urge the plunger 45 upwardly so that. the. ratchetnawl 43 engages one of the -notches 44, thus rendering the connection l6 effective for tightening purposes. In this operationlateralforcein the appropriate direction is. applied manually to the handle 22, which to'gether 'with: the casing l2, shaft l5 and tube 411 seryes as; aleyer for applying a strong rotative force to the driven shaft I4.

"In. many uses of the tool, as for example, in the installation of a cylinder head, it is des rable hat. a l .015 he asten ng leme tss to.,-the.samea e reeof; i htn ss.- Tohis end, the connection between thepo-werunit and the tool head; is;.-made flexibleso that, upon application of, lateral manual force to. finally set afastener there will be an appreciable r613 tive displacement between, the tool head i 3; and power unit l0; capable of utilization in .the, 'actuation of the-indicator means 11.

In the present instance, the tube lmds made, of resilient material. such, for example, spring steel, and-the shaft. ismade flexible; Asillus-. trated, the att r compr ses a. plura ty of nterengaging sections 5,2.- and. 53., the latter forming the terminal end of the shaft which projects intothechambefl I. The, sections 52 are formed ith: e larg d and p tions 4. an hi h se v as bearina r at s o up r t e. drive shaft 15. in. the tube 40.. and asreinfQr ement. for the tube whenit, is; bent under manual aprplication f iomet the q L T io th sh sections, the adjacent end portions. thereof are prov d: w ..d ame r.i a slots; 5 a d n ues Since. t e f...r a. d end. of. t e b ll s rigidly secured within. the bore...39.of, the. tool head boss. r w l be no en ins h s portion of the tube. Accordihsllthe terminal section 53 of the drive shaft: l.5,.. i s or thesame diameter throughout its length,

In the instant embodiment, the meanSip'rovided I to indicate the amount of. displacement of the. power unitrelative to the tool head, in finally setting a fastening element, includes, a tubular housingtllwhichis fixed to the t-ool headboss 38,,and-which extends towardthe power unit- H1 coaxially of the tube 411. and driveshaft IS. The rear portion of this housing isfiattened andoute. wardly flared. and. the upper end thereof" terminates in a 'gearsegment; or rack 31. Positioned on theforward end of the motorcasing I2 is a cap 62 which is supported on needle bearing 63 car-. ried; on theframe collarZl (Fig. 2),. The forward end of the cap 6,2- isfashioned into a pin-. ion; gear fi lwhieh iscoaxial with the tube-411 and drive shaft l5,and -the teeth thereof are. in mesh with those of the rackBl. The rear end: portion 65-of the capis enlarged and extends over-the forward endof the motor casingl-2'. p

Since the. tubularhousing 60 is rigid with'the tool head, it will'not. be displaced upon manual application of; force to the power unit. However, the movement of the power unit with respect: to the tubular housing 6:0 will. cause. the cap 62 on. the forward end of. the motor casing to be rotated and the amount of its angular movement willfbe proportional to the amount of lateraLdis'placement of the tubeand shaft' f'rom normal position. Thus the cap can be calibrated to indicate the am ount of such displacement, and for this pur'pose the enlarged rear end portion'65 of the cap 62'is' provided with acircumferentially; arranged series of markings constitutinga scale 66, which when taken in conjunction witha fixed reference point on the motor casing I2, herein shown in the form of a pointer 6 di at i t th i mmi i displacemerit. The calibration is arranged so that when there is no displacement from normal position, the scale will register zero and displacement in either direction is shown'by correspondinglyim creasing indications in such direction;

'I'he tubular housingnot only serves as an elef ment of the indicator; means, but also provides protection for the w en and drive shaft I5.

fInthe embodiment shown in Figs'fQl to 12, the drive motor BD'ls of the fluid pressureactuated type; having rotation in one direction only. It includes a'rotor 8l fa'ston a spindle 82 and dis-- [posed-within a chamber 03in the motor casing 045*"Th 'sp'indleextends through holes 35 and 86in frame disks Bland 88 and-is journaled adjacent'its ends in bearings 89 and 90 whi'ch in turn are held in the frame disks. O-ne end-of the spindle 82 is connected to a drive shaft 9I dispose'dwithin a tube 92, which connects the power unit and the tool head in spaced relation.

Pressure fluid for the'motor is supplied by way of a'pass'age 03 and admission of pressure-fluid tlo'the motor is controlled by a si nple push buttonvalve94.

" In this embodiment, the teolihead -includes' a housing IOU-of generally cylindrical form'having a chamber It I thereinwhich is closed at 'its top by a plug fitting n12. A "driven shaft was 'journaled in the housing andcar'ries a bevel gear I04 meshing With a bevel inion I95 bn thdiive shaft 9|. Q L

So that the driven shaft I03 may be rotated by the application of a"lat'e ral manual force to the motor'unit' to set 'a fasteiiing element, a'dis- 'engageable pawl" andratchet connection i's"pi-'ovided between the'tool head'housing I and the driven shaft I03'including a "pawl- I00 engageable with a peripherally arranged series of notches 'IO'I' in the bevel gear I04; The pawl I06 is rigid with an actuating plunger 'lfi8 urged inwardly by aspr'mg I09; Y To "render the connection ineffective w hen power is applied to the'motor 80 to drive the shaft I03 the plunger I08 is forced outwardly thereby-holding the pawl lllt out of engagement with themotches "I 07" of the bevel gear' I 04. "As mthe' preceding embodiment; the plunger is forced outwardlyby fluid pressure, and' tdth'is end"a"'pass'age H0 extendsfrorh 'th'e toofhead chamber I0! longitudinally throu'gh"'th'e" drive.

shaft- 9! arid the motor'spindle 82 and coinmu'nicates 'with' 'a' chamber III in the"mo tor casing'84 beyond the-inotor s'pindle bearing 80 When pressure fluid is admitted'tothe'fmotor by the operation of the valve 94 air-from the'inotor chamber-83 passes between theendof the rotor Bfand the frame disk'B'I and thence rearwardlyalong the spindle "82 and thro'ughthe bearing 89 to-thechamber- I II". Thus'when the valve 94' is operated to actuate, the motor,-pressure"is immediatelysupplied tothe tool head chamber I01, and suchpressure 'beingiexerted around the bevel gear I04, operates ontheinner surface of the Plu er-{10. t f r e il outward y a ainst th 6. action of the spring "I03 thereby holding the ratchet pawl I06 out of engagement with the notches I 01 of the bevel gear I04. As previously set forth, when a fastening element has become tight upon running by the power actuated tool, the power is shut off, and as an incident to the interruption of the power, pressure is removed from the tool head chamber and the spring I09 will urge the plunger I00 inwardly so that the ratchet pawl I06 engages one of the notches I01 thereby rendering the connection between the tool head housing I00 and the driven shaft I03 operative when the motor is idle and latching the driven shaft I03 with respect to the tool head.

In the instant embodiment the means provided to indicate the amount of displacement of the power unit, tube and shaft upon manual application of force to finally set a fastener includes a plate II5 which is fixed to the tool head by means of cap screws H6 and which extends toward the power unit in overlying relation to the tube 02 and shaft SI. On the rear end portion of this plate is formed a gear segment or rack IIIfor engagement witha pinion gear I I8 fashioned on the forward end of a cap H9 which is rotatably mounted on the forward end of the power unit. The longitudinal side edges of the plate II5 are turned downwardly to provide ad-' ditional strength. The operation of the instant indicator means is, in general, the same as that set forth for the first embodiment disclosed. However, in the instant embodiment the rear end portion of the cap II9 carries but a single indicator mark I20 and a scale band I2I having a peripherally arranged series of scale markings is fixed to the motor casing 04 thus providing the movable and fixed elements of the indicator means for measuring the amount of torque'pro dueed upon application of lateral manual force for'setting a fastener.

To permit reverse operation in this modified form of the invention, the tool is so constructed that either end of the driven shaft I03 canreceive and support a suitable adaptor to accommodate the fastening element to be driven. In the present instance, the driven shaft I03 is provided with an axially extending square "passage E22 within which is a correspondingly'shaped shank I23, the latter being fashioned for the mounting of a suitable adaptor varying in ac cordance with the character of the fastening element to be driven. As illustrated in Fig. 10, the shank I23 is adapted to occupy two alternative positions axially with respect to the driven shaft I03, so that an adaptor can be mounted on either of its ends. To hold the shank in either of its alternative positions, grooves I24 and 25 are provided in the shaft passage I22 for the reception of pins I26 and I 21 projecting from' the shank I23. As shown, the pins I26 and I27 are urged outwardly for engagement in the grooves I20 and l25by resilient inserts I28 and I 20 positioned in recesses provided therefor in the ends of the, shank I33. Thus operation of the tool in either direction may be obtained by merely presenting to the Work that end of the driven shaft which is rotated in the desired direction. It can be seen therefore that a unidirectional -motor can be utilized to actuate the. tool and by the same token the, pawl and ratchet mechanism can alsobe constructed for unidirectional operation. The construction of the tool is .thus'simp1ified and .its'cost of manufacture reduced.

g, in combin tion a .na; a mo or having a drive. shaf a. tool. connected wi h he p wer unitspaced re ation there an liav n adriv n shaft. iou rial d; there n. p ra iv y. nne e to id drive shaft, a normally engaged connection bea tweensaid driven sha t. and sa d. tool hea wherebyh headand dr v n-shaftcan ero at d tog her vapnl cati n of lateral. ma ual-tomat said power uniu andan. element operatively assoo atsdwi h said. onnec ao uate i ro sponset th arp ationof powerto saidimoto ior. disenea ina the. conn ction...

2. A tool comprising, in combination, a power ncluding. amot r. and a drive shaft, a tool hea c nec sdwith he; p wer unit in? p ced. rel. io theret and, hav ng; a iven shartiours nailed.- the ei sc red to sa d d iv s af an m ausiinolud .s; a, l king memberurovidine a disensageab e; t ing connection between said sha t and s i ool; h ad sa d lo n member. being: automat cal rende ed insii ctive in. e ponse t m tor ac at on. ai d iven shflfi: and madeefiectivein response toithe interrup ion ower to said.- motor so, that saidto l head: and driven shaft. can; berotated together by: application of lateral manual: force to. the p w r: unit,

It. a too o mpris na. in. co bination, apow r unit: 'ricludin v av mot r, with a man ally. 0961M bleoontr devica he o r a drive. shaft, a. ool. head connected with the power unit in spaced relati n. thereto and. a g driven. s a t iouh i lcd he ein sca ed. o. said-1 iveaft. a ratohetdisk secured to-sa d r n s. -il one ativelya ooiatedwith. said-tool head, spr means. n rma y, u g ng; h pawl in ne-asamen with. he dish. and. means in l ding an. lement a tua ed inra ponseto the actuation oi said control device to hold said-pawl out of en-. easement with. said ratche disk; when the too is po er actua ed, sai p l bei u eed by saidspringmeans-intoengagement with the diskupon int rr p i n o pow r t t t l- Wli r -y s d. tool head and driven shaft. can be rotated to-. gether' by application of lateral, manual forceto theipower unit. 7

4-, Atool for connection with a pressure; fluid supply omp i ing, nco b na u. a pow r unit a g f ui pr ssure actu ted m t r, dr ve sh ft r tat d. bysa d mo ors a t o he d. a ub en o s id rive; sha t a d. connec n said. o l. head nd power unit in spa ed re at on a. driv n. shaft. iour a e in sa d o l. head. and soared. to said. dr. essliai i a. membe s pported iii-said o ead; o ma ly o l-e s n said. dr ven shaft; to latch the driven shaft; against rotation r lative. to he headwhsr y saidtool head. a d driven shaftcan berotated as a unit by. applica ion o later l. manu l f rce. to.- sai o uni and an. element. operat vely associated w h. ai mem er and hav ng, o ne tion. W h he. flui pressure supply for automatically shifting said member out of engagement with the drivenshaft upon application of pressure fluid to said motor whereby to free the driven shaft for rotation in the head.

5-. A tool comprising, in combination, a power unit including a reversible motor having a drive shaft, 2, tool head connected with the power unit in spaced relation thereto and having a driven shaft'journaled-therein geared to said drive shaft, a. ratchet disk secured to the driven shaft; a p ma ly en agement. with said. disk,

a plunger; in. said toolhead movable; between alternative position an perable. response tothe application of power tothemotor to. shift said pawl out of; engagement. with. said disk, and means o reverse'saidrawl with. re pe to s d disk whereby said driven. shaftv can be, latched with re pe t tosaid ool head t p rmit rotation in. alt rnative dire tions of. said. shaft. and. tool headasa unit upon application or latwalmam ualforce.

6. A. combin d. nut. runnerandtorque wrench, comprising, in. combination, a power aving: a flexible driveshai 8.. tool head, a. resilient tube supporting said tool head on. said power unit. in paced e a io thereto. a d iver trait journaled in said, tool. head. and. operatively: cons nected. to. said drive shaft, 9,, disengageable conmo ion. between. aid, driv n-sha n said. too head operative,- to permit said tool head, and driven Shaft to be. ro a ed to ethe by application. of. lat r l manual forceto he power and an. indioatorresponsive to rel tive. di place: mentjbetweensaidpow r unit and said; t ol he d upon application of said: forcewhereby the amount of torque producedv can, be measured.

'7. A combined nut runner and; torque wrench comprising, in combination, a power including a casing, amotor within, the casing havin a drive. shaft extending: beyon said. casi g a tool head, a tube enclosing said drive shaft and connecting said toolhead and. Said casin in spaced relation, a driven shaft journaled in said tool head and geared to said driveshaf-t, a disengageable connection between said driven shaft and said tool head operative to, permit said head and shaftto be rotated by -application o1.- lateral manual force to said oasingwhi-leusing said casing, shaft and tube as a lever; and in dicator means responsive: to, relative lateral movement between said tool head and; saidpower i p pplic i nof such force,. said. drive shaft and tube being made flexible to; permit of such relative movement,

8. A combined nut runner and torquewrench comprising, in combination, a power unit in-.- cluding a casing, a motor within the casing havinga drive shaft extending; beyond said casing, a tool head, a tube enclosing said drive shaft and connecting said tool head and said casing, a driven shaft journaled in; said tool head and geared to said drive shaft; a disengageable connection between said driven shaft and said tool head operative to permit rotation of said head and shaft by application of lateral manual force to said power unit; and indicator means respons sive to relative.- lateral movement between, said tool head and said power unit upon application of such force, said tube being resilient and said drive shaft comprising a pluralitvof. sections loosely coupled together to permit of" suchrelative movement:

'9. A tool comprising, in combination, a power unitincluding a motor having a drive shaft,- a tool head connected with said power unit in spaced relation thereto a driven shaft j ournaled in said tool head. a first gear element secured to said drive shaft, a second gear element secured to said driven shaft. in mesh with said first element and having" notches therein, a plunger in said head adiacent saidsecond gear element and havinga ratchet pawl thereon for engagement in said notches, aspring-urging'said plunger and pawl toward said'second gear element; and meansresponsive tothe act at on of said motor for -shifting said plunger to-hold sald tending therefrom, a tool head-having a cham- I Mr therein, a tube enclosingsaid drive shaft and connecting said tool head and said casing spacedrelation, a driven shaft journaled in said chamber and connected with said drive shaft,a ratchet disk secured to said driven shaft within said chamber, a plunger extending into said chamber and having a ratchet pawl thereon for engagement with said disk, a spring urging 7 said plunger toward said disk,randmeans connecting said chamber withthe fluid pressure supply including a passage extending axially of said drivev shaft, whereby said plunger is forced away fromrsaid; disk by fluid pressure when said motor is operated and is forcedtoward said disk by the action of said spring upon interruption of the fluid pressure supply so that'said pawl engages said disk ,to latchsaid driven shaft and'tool head togetherwtoipermit, rotation thereof by application of lateralmanualforce to said casing.

11. A combined nut runner and torque wrench comprising, in combination, a power unit having a casing, a motor within said casing having a flexibledrive shaft extending therefrom,a tool head'a resilient tube enclosing saiddrive shaft and connecting said tool head and said power unit in spaced relation, a driven shaft journaled in said head and geared to said drive shaft, a disengageable connection between said tool head and said driven shaft operative-to permit rotation of said tool head and driven shaft by application of lateral manual force to said power and connecting said tool head and said power unit in spaced relation, a driven shaft J'ournaled in said head and geared to said drive shaft, a

disengageable connection between said tool head and said driven shaft operative to permit rotation of said tool head and driven shaft by application of lateral manual force to said power unit, and indicator means including a tubular member rigid with said tool head extending coaxially with respect to said flexible drive shaft and tube and having a rack gear segment on its rear, end portion, and a cap rotatably mounted on said casing having its forward end portion fashioned into a pinion gear in mesh with said rack gear segment and having a scale on its rear end portion, said cap being rotated with respect to said casing upon relative displacement of said tool head and casing upon application of said force whereby the amount of force applied can be measured. l

13: A combined nut runner and torque wrench comprising, in combination, a power unit having a casing, a motor within said casing having a flexible drive shaft extending therefrom, a tool 10 head, a resilienttube enclosing ,said, driveshaft and connecting said tool headaiids'aid' power unit in spaced relation, a driven s'haft'journaled in said head and geared "to said drive shaft, a disengageableiconnection betweenls'aid tool head and said driven shaft operative to permit rotation of said tool head and driven shaft by apf-.

plication of lateral manualforce to' said power unit,; a'nd indicator means including a tubular member rigid with said tool head extending coaxially with respect to said flexible drive shaft and tube and having arack gear segment, on its, rear end portion, and a cap rotatably mounted on said casing havingits forward end portion fashioned into a pinion gear "inimesh with said rack gear segment and having a scale on its rear end portion, said cap being rotated with re speet to said casing upon relative displacement of said tool headand casing upon application ofsaid force. I I

14, A combined nut-runner and torquewrench comprising, in combinatioma powenunit having a casing, a motor'withinsaid casing having a flexible drive shaft, a tool head, a resilient tube enclosing said drive shaft and connecting said tool head and said power unit in 'spaced relation, a driven shaft journaledv in said :head and geared to said drive shaft, a disengageable connection between said tool head and saiddriven shaft operative to permit rotationof said 'tool head and driven shaft by application of -.lateral manual force to said power unit, and indicator means including a plate rigid with said tool head and extending toward said power unit in overlying relation to said tube and drive shaft and having a rack gear segment on its rear end portion, a cap rotatably mounted on said casing having its forward end portion fashioned into a pinion gear in mesh with said rack gear segment and havinga reference mark thereon, and a 'flxed scale on said casing adjacent said cap, said cap being rotated with respect to said fixed scale upon relative displacement of said tool head and said casing upon application of said force whereby the amount of force applied can be measured.

15. A tool comprising, in combination, a power unit having a drive shaft, a tool head, a tube journaling said drive shaft and connecting said tool head and power unit in spaced relation, a driven shaft operatively connected with said drive shaft and journaled in said tool head, a member supported in said tool head and coacting with said driven shaft to hold the driven shaft against rotation relative to the head, yieldable means normally urging said member into holding engagement with said driven shaft so that said tool head and driven shaft can be rotated together as a unit by application of lateral manual force to said power unit, means responsive to the application of power to the tool for automatically shifting said member against the action of said yieldable means and out of engagement with said driven shaft to free the driven shaft for rotation in the head.

16. A tool comprising, in combination, a power unit including a motor and a drive shaft, a tool head connected with the power unit in spaced relation thereto and having a driven shaft journaled therein geared to said drive shaft, and pawl and ratchet members interposed between said driven shaft and said tool head, one of said members being responsive to the application of power to the motor so as to be ineffective when said driven shaft is motor actuated so as to free said driven shaft for rotation with respect to said *toolfhead; an'd"'mea'n's including an "element op;- {er'at'ive inresponse to the interruption or power to sa'id motor to effect engagement between -said pawhand ratchet members whereby said tool 'head'and "driven" shaft can be rotated together 'bvapplioation of "lateral "manual force to the power unit.

'17. In a tool having 'a'power unit including "a "motor "with a "drive shaft, the combination of a "tool head having a driven shaft journaled thereinadapted to be driven by the drive shaft, means providing a handle'eiitending laterally from said "tool head in a generally radial "direction with respect to said driven'shaftja member supported in said tool head and "coac't'ing with said-drivenshaft to hold the driven shaft against "rotation rela'tive to said tool head, yildable means=normal1y urgingsaid "member into holdin'g engagement with said driven "shaft whereby said tool head and said driven shaft can-bemotated as amiit by application of lateral manual ierce -to said-handle, and means responsive to the "application of power't'o the tool for automatically shifting said member against the action of said 'yieldable means and out of engegement with the driven shaft to free the same tor rotation with respect to the tool head by said power unit.

18. In a poweractuat'ed tool, thecombinatibn of a tool head, "a driven 'shaft journaled insaid --too1- head, means defining a handle carried by said tool head and extending laterally therefrom 12 in a generally radial direetion with respect said driven shaft, and means 'inoludinga-iloek in member providing a disengageable'latohing connection between said driven shaft and said tool head, said locking member being responsive to the application'oi power to the tool so as to be inefiective whereby said shaft can be power driven, said locking -member being-effective response to the interruption-otpower to the tool so that said tool head and driven shaft ean be rotated together by application of lateral manual force to the handle.

1 ERIIFST H.

REFERENCES CITED 7 The following references are of record in the file of "this patent:

UNITED STATES PATENTS Number Name Date 1,394,089 Herman :Oct'. 1-8, 1921 1,628,467 Mandi May '10, 1927' 1,970,179 Miller t. Aug. 14, 1934 2,086,261 Douglass July 6, 1937 2,159,373 Dunn May 23, 1939 2,176,928 Short Oct. 24, 1939 2,179,724 Kuehne Nov. '14, 1939 FOREIGN PATENTS Number Country Date 601,446 France July 31,, 1925 408,895 Great Britain Apr, 19, 193-1: 

